两个英语小问题,1.Not once since my son went to school ( ) traveling

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两个英语小问题,
1.Not once since my son went to school ( ) traveling with him
A had I gone B have I gone
这题为什么选的是B而不是A啊?
2.是不是跟在s后面的音都要读浊音啊,如straight后面的tr就要读浊音,都是这样吗?

因为前边有since（至那时起到现在）,说明是现在完成时,意思是“从我的小孩上学开始”,表明了对现在造成的影响（我就再没和他一起旅行过了）
s后边一般是清辅音就读成浊辅音.

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